#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<vector>
#include<string>
#include<unordered_map>
#include<algorithm>
using namespace std;
class Solution {
public:
    vector<vector<string>> groupAnagrams(vector<string>& strs) {
        unordered_map<string, vector<string>> hash;
        vector<vector<string>> ret;
        for (auto& e : strs)
        {
            string tmp = e;
            sort(tmp.begin(), tmp.end());
            hash[tmp].push_back(e);
        }
        for (auto& [x, y] : hash)
        {
            ret.push_back(y);
        }
        return ret;
    }
};